我已尝试使用以下代码(我已遵循示例)来测试从日历中选择的日期。如果我的数据库中不存在该日期,则应向最终用户显示验证错误消息。然而,错误并没有以<h:message>
,而是将其记录到服务器日志中。
View:
<p:calendar id="date1" value="#{bean.date1}" showOn="button">
<f:validator validatorId="calendarValidator" />
<f:ajax execute="date1" render="calendarmessage" />
</p:calendar>
<h:message id="calendarmessage" for="date1" />
验证器:
@FacesValidator("calendarValidator")
public class CalendarValidator implements Validator{
@Override
public void validate(FacesContext context, UIComponent component, Object value) {
java.util.Date date2 = (java.util.Date) value;
try {
if (validateDate(date2)) {
throw new ValidatorException(new FacesMessage("A valid date"));
} else {
throw new ValidatorException(new FacesMessage("date dont figure in the database"));
}
} catch(Exception e) {
e.printStackTrace();
}
}
}
服务器日志:
INFO: date invalide
GRAVE: javax.faces.validator.ValidatorException: date dont figure in the database
at DAOKPI.CalendarValidator.validate(CalendarValidator.java:60)
at javax.faces.component.UIInput.validateValue(UIInput.java:1149)
at javax.faces.component.UIInput.validate(UIInput.java:967)
at javax.faces.component.UIInput.executeValidate(UIInput.java:1233)
at javax.faces.component.UIInput.processValidators(UIInput.java:698)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214)
at javax.faces.component.UIForm.processValidators(UIForm.java:253)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214)
at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1172)
at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:409)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1
再次查看您的代码,您正在捕获并打印ValidatorException
自己在验证器里面!您不应该捕获并记录ValidatorException
你自己。您应该放开它,让 JSF 捕获并处理它,以便它可以相应地在消息组件中显示它。
Get rid of the try
阻止验证器并添加throws
条款至validate()
method.
@Override
public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
java.util.Date date2 = (java.util.Date) value;
if (validateDate(date2)) {
throw new ValidatorException(new FacesMessage("A valid date")); // Btw: I wonder how that makes sense... That's actually not a validation error.
} else {
throw new ValidatorException(new FacesMessage("date dont figure in the database"));
}
}
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